You did not mention the acquisition of Redhat by IBM in 2018. At the time, many observers were worried about what IBM would do with Redhat, and always wondered when IBM would go corporate crazy over a company with a model based on open source. So this decision crystalize the doubts that many people had at the time, that IBM would milk Redhat more, and this induce a kind of "Yep, of course they did go corporate crazy!" reaction.

Many people feel burned and don't want to invest more efforts in a company with this kind of methods (they did not even allow a grace period) and want to jump ship.